LOCATION MAYOWORTH WY+CO MTEstablished Series
TAXONOMIC CLASS: Fine, smectitic Ustic Argicryolls
TYPIFYING PEDON: Mayoworth silt loam, native pasture. (Colors are for dry soil unless otherwise stated.)
A--0 to 7 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; strong fine granular structure; soft, very friable, slightly sticky and slightly plastic; many fine and very fine roots; many fine and very fine pores; slightly acid (pH 6.4); clear smooth boundary. (4 to 8 inches thick)
BA--7 to 12 inches; grayish brown (10YR 5/2) silty clay loam, very dark grayish brown (10YR 3/2) moist; weak medium prismatic structure parting to moderate fine subangular blocky; slightly hard, very friable, slightly sticky and slightly plastic; many fine and medium pores; common fine and medium pores; few faint clay films on some faces of peds; slightly acid (pH 6.5); clear smooth boundary. (3 to 7 inches thick)
Bt1--12 to 27 inches; brown (7.5YR 5/4) clay, dark brown (7.5YR 4/4) moist; moderate medium prismatic structure parting to strong medium angular blocky; slightly hard, friable, sticky and plastic; many prominent clay films on faces of peds and lining pores; slightly acid (pH 6.5); gradual smooth boundary. (5 to 16 inches thick)
Bt2--27 to 34 inches; pale brown (10YR 6/3) clay loam, brown (10YR 5/3) moist; moderate medium subangular blocky structure; slightly hard, firm, sticky and plastic; few distinct clay films on faces of peds; slightly acid (pH 6.5); gradual smooth boundary. (3 to 9 inches thick)
Cr--34 to 40 inches; bedrock consisting of layers of slaty shales and interbedded soft shales.
TYPE LOCATION: Johnson County, Wyoming. Approximately 110 feet south of the tract corner between tracts 40, 41 and 38 in T.47N., R.85W.
RANGE IN CHARACTERISTICS: Mean annual soil temperature is 44 degrees F. Mean summer soil temperature is about 54 degrees F. Depth to the paralithic contact ranges from 20 to 40 inches. Depth to the base of the argillic horizon ranges from 15 to 40 inches. Rock fragments range from 0 to 15 percent and are 1/2 to 3 inch channers.
The A horizon has hue of 5Y through 7.5YR, value of 4 or 5 dry, 2 or 3 moist, and chroma of 1 through 3. Reaction is slightly acid through slightly alkaline.
The Bt horizon has hue of 5Y through 7.5YR. It is typically clay loam or clay and has 35 to 50 percent clay. Reaction is slightly acid through slightly alkaline.
COMPETING SERIES: These are the Beaverdam, Blackhorse (T), Brinkert, Buckskin, Florissant (T) Gothic, Heath, Heathcoat, Helmet (T), Jerry, Judy, Little Horn, Owen Creek, Piltz, Sessions Sneffels, Trout Creek, and Youman series. Beaverdam, Blackhorse, Brinkert, Buckskin, Gothic, Heath, Heathcoat, Helmet, Jerry, Sessions, Trout Creek, and Youman soils are very deep. Florissant and Owen Creek soils have secondary accumulations of calcium carbonate, in the profile. Judy, Littlehorn, and Sneffels soils have a lithic contact at 20 to 40 inches. Piltz soils have 15 to 35 percent granitic gravel in the Bt horizon.
GEOGRAPHIC SETTING: Mayoworth soils are on gently sloping to steep hillslopes, mountain slopes and ridges. Slopes are 2 to 50 percent. These soils formed in alluvium, colluvium, and residuum weathered from slaty shales. Annual precipitation is 18 to 30 inches with peak periods of precipitation in the spring and early summer. At the type location the average temperature is 38 degrees F., average summer temperature is 52 degrees F. Elevation is 7,500 to 9,500 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Leaps, Judy, and Heath series. Heath soils lack bedrock above 40 inches. Judy soils have secondary accumulations of Calcium carbonate. Leaps soils lack an argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is rapid and permeability is slow.
USE AND VEGETATION: These soils are used for native pastureland and for recreational purposes. Principal native vegetation includes big sagebrush, prairie junegrass, bottlebrush squirreltail, yarrow, and some Ponderosa pine.
DISTRIBUTION AND EXTENT: Mountainous areas of Colorado and Wyoming. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Piedra Area, Colorado, 1974.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
mollic epipedon - 0 to 12 inches (A, AB)
argillic horizon - 12 to 34 inches (Bt1, Bt2)
paralithic contact - 34 inches (Cr)
MLRR- E
SIR- WY0123